/*
 * Copyright (c) 2010-2020 Nathan Rajlich
 *
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use,
 * copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following
 * conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 */

package org.java_websocket.issues;

import java.io.IOException;
import java.net.BindException;
import java.net.InetSocketAddress;
import java.net.URI;
import java.net.URISyntaxException;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Collection;
import java.util.ConcurrentModificationException;
import java.util.List;
import java.util.concurrent.CountDownLatch;
import org.java_websocket.WebSocket;
import org.java_websocket.client.WebSocketClient;
import org.java_websocket.handshake.ClientHandshake;
import org.java_websocket.handshake.ServerHandshake;
import org.java_websocket.server.WebSocketServer;
import org.java_websocket.util.SocketUtil;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.Timeout;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.MethodSource;

import static org.junit.jupiter.api.Assertions.assertFalse;

public class Issue879Test {

  private static final int NUMBER_OF_TESTS = 20;

  @Timeout(10000)
  @ParameterizedTest()
  @MethodSource("data")
  public void QuickStopTest(int numberOfConnections) throws InterruptedException, URISyntaxException {
    final boolean[] wasBindException = {false};
    final boolean[] wasConcurrentException = new boolean[1];
    final CountDownLatch countDownLatch = new CountDownLatch(1);

    class SimpleServer extends WebSocketServer {

      public SimpleServer(InetSocketAddress address) {
        super(address);
      }

      @Override
      public void onOpen(WebSocket conn, ClientHandshake handshake) {
        broadcast("new connection: " + handshake
            .getResourceDescriptor()); //This method sends a message to all clients connected
      }

      @Override
      public void onClose(WebSocket conn, int code, String reason, boolean remote) {
      }

      @Override
      public void onMessage(WebSocket conn, String message) {
      }

      @Override
      public void onMessage(WebSocket conn, ByteBuffer message) {
      }

      @Override
      public void onError(WebSocket conn, Exception ex) {
        if (ex instanceof BindException) {
          wasBindException[0] = true;
        }
        if (ex instanceof ConcurrentModificationException) {
          wasConcurrentException[0] = true;
        }
      }

      @Override
      public void onStart() {
        countDownLatch.countDown();
      }
    }
    int port = SocketUtil.getAvailablePort();
    SimpleServer serverA = new SimpleServer(new InetSocketAddress(port));
    SimpleServer serverB = new SimpleServer(new InetSocketAddress(port));
    serverA.start();
    countDownLatch.await();
    List<WebSocketClient> clients = startNewConnections(numberOfConnections, port);
    Thread.sleep(100);
    int numberOfConnected = 0;
    for (WebSocketClient client : clients) {
      if (client.isOpen()) {
        numberOfConnected++;
      }
    }
    // Number will differ since we use connect instead of connectBlocking
    // System.out.println(numberOfConnected + " " + numberOfConnections);

    serverA.stop();
    serverB.start();
    clients.clear();
    assertFalse(wasBindException[0], "There was a BindException");
    assertFalse(wasConcurrentException[0], "There was a ConcurrentModificationException");
  }

  public static Collection<Integer[]> data() {
    List<Integer[]> ret = new ArrayList<Integer[]>(NUMBER_OF_TESTS);
    for (int i = 0; i < NUMBER_OF_TESTS; i++) {
      ret.add(new Integer[]{25 + i * 25});
    }
    return ret;
  }

  private List<WebSocketClient> startNewConnections(int numberOfConnections, int port)
      throws URISyntaxException, InterruptedException {
    List<WebSocketClient> clients = new ArrayList<WebSocketClient>(numberOfConnections);
    for (int i = 0; i < numberOfConnections; i++) {
      WebSocketClient client = new SimpleClient(new URI("ws://localhost:" + port));
      client.connect();
      Thread.sleep(1);
      clients.add(client);
    }
    return clients;
  }

  class SimpleClient extends WebSocketClient {

    public SimpleClient(URI serverUri) {
      super(serverUri);
    }

    @Override
    public void onOpen(ServerHandshake handshakedata) {

    }

    @Override
    public void onMessage(String message) {

    }

    @Override
    public void onClose(int code, String reason, boolean remote) {

    }

    @Override
    public void onError(Exception ex) {

    }
  }
}
